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Old 10-20-2022, 01:07 PM   #21
Bus Crazy
 
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Join Date: Oct 2020
Location: Florida
Posts: 1,540
Coachwork: Integrated Coach Corp.
Chassis: RE-300 42ft
Engine: 466ci
Rated Cap: 90
Gap Over Each Window

Quote:
Originally Posted by kbel View Post
Thanks.... great advice. I'll do just that. Woodstoves go a long way to get rid of moisture, but I'll definitely research best methods. Condensation and airflow are real concerns.
Thank you, Powderskier for the tips on windows & haybales. Good stuff .

Since we are on the subject of windows...



There is a hollow area above each window which allows air to freely pass above. No rain travels up and over, but a great deal of convection is occurring.

Every night when the relative humidity equals the dew point, water beads collect and run down the frame sides.

No rain required. Condensation forms where moist warm & cold dry air meet, then gravitate below. If it then ices, add expansion to the mix...
ask a northen Thomas owner about their plastic window frames.



Into the void, above each window, we inserted 1-1/2" dia, closed cell backer rod.
CCBR is normally used in interior floor expansion joints as an insulated, water-proof barrier for expansion caulk backing.



A scrap section of 1-1/2" closed-cell backer rod, demonstrates the size of the void in the steel channel, above the stock IC windows.
You can also see sunlight through the gap above the adjacent window, just behind the AL frame lip

Accounting for each window, a total of 59.5 feet of 1-1/2" air gap. Burrrr



Notice the size of the opening at the top of the frame. When the factory installed window is in place, the space is still visible.




1-1/2" diameter, closed cell backer rod fills the empty void between the aluminum & the steel. $0.50/ft to stop convection of both the outside air and conduction of steel frame temps.

An unexpected side effect, it's much quieter on board.


Not just the pax windows. Same issue over the fixed glass & drivers slider, too.

Check yours at night time with a flashlight & a partner. Peer over the top, one person inside one outside.

I'm in Florida, but convection & condensation work the same, although our wet is on the exterior.

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Old 10-20-2022, 02:01 PM   #22
Mini-Skoolie
 
Join Date: Jan 2019
Location: Ontario, Canada
Posts: 12
Year: 2005
Coachwork: International
Chassis: IC 200 RE
Engine: t444e (7.3)
Quote:
Originally Posted by DeMac View Post
Thank you, Powderskier for the tips on windows & haybales. Good stuff .

Since we are on the subject of windows...



There is a hollow area above each window which allows air to freely pass above. No rain travels up and over, but a great deal of convection is occurring.

Every night, when the relative humidity equals the dew point, water beads collect and run down the frame sides.

No rain required. Condensation forms where moist warm & cold dry air meet, then gravitate below. If it then ices, expansion...ask a northen Thomas owner about their glass window frames.



Into the void, above each window, we inserted 1-1/2" dia, closed cell backer rod.
CCBR is normally used in interior floor expansion joints as an insulated, water-proof barrier for expansion caulk backing.



A scrap section of 1-1/2" closed-cell backer rod, demonstrates the size of the void in the steel channel, above the stock IC windows.
You can also see sunlight through the gap above the adjacent window, just behind the AL frame lip

Accounting for each window, a total of 59.5 feet of 1-1/2" air gap. Burrrr



Notice the size of the opening at the top of the frame. When the factory installed window is in place, the space is still visible.




1-1/2" diameter, closed cell backer rod fills the empty void between the aluminum & the steel. $0.50/ft to stop convection of both the outside air and steel frame temps. An unexpected side effect, it is much quieter on board.


Not just the pax windows. Same issue over the fixed glass & drivers slider, too.

Check yours at night time with a flashlight & a partner. Peer over the top, one person inside one outside.
Wow.... great advice. Simple solution. I'm going to look for that void when I'm at my bus next.
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